AUTHORS: Move authors from src to AUTHORS

AUTHORS: Move authors from src to AUTHORS

This is in preparation of replacing all license headers with a spdx
identifier, removal of copyright notices in individual files comes
later.

The missing authors were determined by "git grep Copyright src"

Change-Id: Id9942f9f9a26484bbc22584bba7b3af5846eefe8
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39605
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Wim Vervoorn <wvervoorn@eltan.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>